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Adds tileset_explorer_tool and its MCP App. The tool reads a tileset's TileJSON and returns its source layers, fields and zoom range, without the tile URLs, which carry the caller's token. The app draws every source layer in its own color, toggles layers, shows tile boundaries and a base map, and inspects a clicked feature. In ChatGPT it opens as a tab, is a thread entrypoint, shares the tileset, view and selected feature as model context, and registers load_tileset and read_tileset_view through WebMCP.
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Stacked on #333. Adds
tileset_explorer_tooland its MCP App, to look inside a vector (MVT) or raster tileset from a chat.tileset_id(username.id, or several vector tilesets joined with commas), reads its TileJSON and returns the source layers, their fields and the zoom range. The TileJSONtilesURLs carry the caller's token, so only metadata is returned.mapbox://with the account's public token, so a private tileset shows only for its own account.load_tilesetandread_tileset_viewthrough WebMCP, so the model switches tilesets and reads features in the open explorer instead of opening another.Verified: build and unit tests pass (1318), and a local dev server lists
tileset_explorer_tool.Not verified: anything in ChatGPT yet.